ncp1396 ON Semiconductor, ncp1396 Datasheet - Page 19

• Manufacturer Part Number: ncp1396
• Description: High Performance Resonant Mode Controller With High And Low Sides Drivers
• Manufacturer: ON Semiconductor

Brown-Out Protection
resonant converter from low DC input voltages. Below a
given level, the controller blocks the output pulses, above
it, it authorizes them. The internal circuitry, depicted by
Figure 44, offers a way to observe the high-voltage (HV)
rail. A resistive divider made of Rupper and Rlower, brings
a portion of the HV rail on pin 5. Below the turn-on level,
the 26.5 mA current source IBO is off. Therefore, the
turn-on level solely depends on the division ratio brought
by the resistive divider.
The Brown-Out circuitry (BO) offers a way to protect the
-4.00
-8.00
4.00
3.00
2.00
1.00
16.0
12.0
8.00
4.00
8.00
4.00
0
0
0
56.2 m
A - B
Clock Pulses
Ct Voltage
Figure 43. Typical Oscillator Waveforms
65.9 m
DT
NCP1396A, NCP1396B
http://onsemi.com
time in seconds
19
75.7 m
Figure 44. The Internal Brown-out Configuration with
DT
DT
Rupper
Rlower
an Offset Current Source
Vbulk
85.4 m
IBO
BO
Vdd
+
VBO
ON/OFF
+
-
95.1 m
BO